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1: Verify the error
I have seen a couple of situations in which an installation error was displayed even though Java installed correctly. Therefore, I recommend beginning the troubleshooting process by verifying that Java really isn't working. The easiest way to do this is to go to this special test page, which will tell you conclusively whether Java is working.

2: Remove version conflicts
If the installation appears to succeed, but Java is not working, check to see whether the Java Control Panel exists within the Windows Control Panel. If the Java Control Panel is missing, the problem is often related to a conflict with JavaFX or legacy Java code. In these situations, you should use the Windows Control Panel to remove any instances of Java. After doing so, use theMicrosoft uninstaller to clean up any Java fragments. Then, try installing Java again.
3: Use the offline installer
The Web installer for Java tends to be a little bit buggy. That being the case, the offline installer package will sometimes succeed where the Web installer fails. You can download the offline installer for Windows.
4: Try the 32-bit version
If you're having trouble installing a 64-bit version of Java, try using the 32-bit version instead. Although 64-bit Java would seem to be the logical choice for use on a 64-bit operating system, the 32-bit version seems to have fewer issues.
5: Install with administrative privileges
If you run into problems installing Java on Windows 7 or Windows 8, try installing Java as an administrator. To do so, download the offline installer and save it to an empty folder on your hard disk. Then, right-click on the executable file and choose the Run As Administrator command from the shortcut menu.
6: Temporarily disable User Account Control
Some people have reported that the User Account Control feature gets in the way of installing Java. If you suspect that the User Account Control feature is causing your problem, you can temporarily disable it until after the installation is complete. The method for doing so depends on the version of Windows you're using. In Windows 8, the option to change the User Account Control settings is found in the Control Panel under System And Security ' Action Center.
7: Set Internet Explorer's security to the default level
If Internet Explorer is configured to use a higher-than-default security level or if it is running a custom security level, there is a possibility that Java may be blocked. You can set Internet Explorer to the default security level by opening your browser and selecting the Internet Options command from the Tools menu. When the Internet Options dialog box appears, click on the Security tab and click the Default Level button. Click OK to save your changes.
8: Temporarily disable your antivirus scanning
There have been some reports of antivirus software preventing Java from being installed. If you want to see whether your antivirus is causing your problem, I recommend downloading the offline installer, updating your antivirus software, and then performing a full system scan. This will help make sure that there are no infections on your system before you disable the antivirus software.
Once you're confident that your system is free of malware, you can temporarily disable the antivirus scanning process. The method of doing so will depend on the antivirus product you are using, but often it is possible to right-click on the antivirus software's taskbar icon and choose a pause option from a shortcut menu. When you have finished attempting your Java installation, don't forget to re-enable antivirus scanning.
9: Check for a corrupt user profile
According to Microsoft, a corrupt user profile can cause problems with Java installations. Try creating a new user and assign that user local administrative permissions. Then, log in using the new user account and try installing Java.
10: Use the System Configuration tool
Since problems with Java installations are often related to other software that is running on the system, you may be able to fix the problem by temporarily disabling other startup items. The easiest way to do that is to open a Run prompt and enter the MSCONFIG command. This launches the Windows System Configuration utility, which allows you to choose the startup items that you want to disable without requiring any permanent changes to the operating system.
Other tricks?
Have you found some other workarounds or fixes for dealing with Java install headaches? Share your suggestions with fellow TechRepublic members.

I have had the same issue on certain machines.

For me uninstalling and clearing the Cache before getting a new version worked most often.

Some virus make the contents of the drive hidden, thats why user can't see the files. This can be fixed and data would be available to you. However, there are number of steps involved.It is suggested that go to FOLDER OPTIONS - and select 'SHOW HIDDEN FILES & FOLDERS' and uncheck/ Deselect 'HIDE PROTECTED SYSTEM FILES'. It would show the hidden files/ folders, if the system not infected Otherwise, from the clean/ virus free system you can see your data and copy all the required files/data. Select the required files and right-click and change the properties of the file by un-checking the hidden attribute. Please note that you can not change the properties (hidden attribute of the files) if the files are marked as system files. To change the attribute of such folders you can download and use iReset. Just select the file or folder and its just as easy to drag and drop to reset all attributes and make the files visible again.(Note that you can reset one folder or file at a time)

Also, make sure that you have a good antivirus installed and its updated. Scan your system and clean it.

A virus is program that has malicious content in it and replicates itself and a Trojan horse is program that will only work if the user executes it. Sometimes, a Trojan horse covers itself as a fake folder while in fact, it's an .exe file. The good thing about Trojan horse is that it is not that hard to get rid of them. But the bad thing about Trojan horse is that it is a little bit difficult to find them.Although, it does not corrupt files or delete data stored on your hard disk until you execute it.Once executed, it will allow the hackers to indentify your credit card number, social security number, bank account details or some other private information.You can delete or remove the hidden Trojan horse with the help of antivirus software. Either, you can also try the manual process to delete it or you can follow these steps:STEP 1 Open the System Information Utility (msinfo32.exe). You can find the System Information Utility by typing “msinfo32.exe” in ‘Run’. This program lists all the processes running on any Windows system, even those processes that are hidden from the task list. Now open your virus scanner and run the executable or .dll through it.STEP 2 Open your antivirus software and run a virus scan. If you don't have a antivirus software installed, download AVG Anti-Virus Free Edition 7.5. And run a scan using it. After the scanning process is completed, delete the value that was detected from the registry (before doing this step, take a backup of the registry files):A) Click ‘Start’ > ‘Run’. B) Type "regedit". C) Click "OK". D) Go to the subkey:HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunServices HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesE) Now delete any value from the right pane that was detected during the scan process. F) Exit the Registry Editor.

Often, the cause of corruption in a computer system is a bad download that installs harmful files.

If you started to get the Appcrash error on your system after downloading a new program or software from the Internet, it's highly likely you have downloaded a bad product.

Use the "Add/Remove Programs" feature in the Control Panel to get rid of the program immediately.

Uninstall the program that is crashing.

It is possible to fix the program's corrupted files while the program is still installed, but to make sure that you clear the program files completely, it is safest to completely uninstall it from the system.

Run a full scan of your computer.

Your computer should already have antivirus software installed that can scan for corrupted files and either fix them or delete them from your system.

If you do not have antivirus software on your computer, that could be a big part of the problem.

Purchase and install antivirus software as soon as possible.

Once you have the antivirus program installed, open it and click "Scan Computer."

The antivirus scan will isolate bad files and you will be given the option to remove them from your system.

Reinstall the program that was crashing.

Now that the corrupted files have all been removed, your program should run smoothly after reinstallation.

Check for program incompatibility.

If, after a thorough scan and cleaning of your computer and reinstallation of your program, the

Appcrash errors continue, the program you are trying to use may not be compatible with your operating system or other programs on your computer

rather than purchasing an antivirus program use one of these freeware programs

Some virus make the contents of the drive hidden,
thats why user can't see the files. This can be fixed and data would be
available to you. However, there are number of steps involved.It is
suggested that go to FOLDER OPTIONS - and select 'SHOW HIDDEN FILES
& FOLDERS' and uncheck/ Deselect 'HIDE PROTECTED SYSTEM FILES'.

It
would show the hidden files/ folders, if the system not infected
Otherwise, from the clean/ virus free system you can see your data and
copy all the required files/data. Select the required files and
right-click and change the properties of the file by un-checking the
hidden attribute. Please note that you can not change the properties
(hidden attribute of the files) if the files are marked as system files.
To change the attribute of such folders you can download and use iReset.
Just select the file or folder and its just as easy to drag and drop to
reset all attributes and make the files visible again.(Note that you
can reset one folder or file at a time)

Also, make sure that you have a good antivirus installed and its updated. Scan your system and clean it.

When you say that 3% of your drive space has been taken up without you loading files on to the drive, this makes me think you may have a virus on one or both drives. If your antivirus software isn't detecting anything try a third party (free) online scan. Make sure you disable your installed antivirus software before beginning the scan. Kaspersky.com or TrendMicro.com offer good scans that automatically clean most infected files.
If there is a virus present it won't do you any good to simply restore the C drive only.

If this virus really deletes the files its really hard to recover it. But if the virus just hide your files. You can still recover it. Just unhide all hide files then look for your files if it is still there. If you can make a copy do it. You can also do this way. Type the filename you need on the search bar and use look also for hidden files option.

If you can make a copy do it. Then test it on a different computer with a good known updated antivirus installed. If your needed files will be deleted by that antivirus, if not then that solves your problem. Your other files to be follow.

Hope this helps you.

For the pop up virus deal with it, try to use Avira free antivirus.

Also what is youre operating system? If this doesn't help you we can device another solution

The following process will help you remove Antivirus 2009 from your system easily and safely.

Antivirus 2009 Manual Removal Process:
1. Click on the Start Menu button, then click on the Control Panel option, and then Double-click on the Add or Remove Programs icon.
2. Locate Antivirus 2009 and double-click on it to uninstall Antivirus 2009. Follow the screen step-by-step screen instructions to complete uninstallation of Antivirus 2009. Do not worry about this if you cannot find it in Add/Remove window. Simply skip to #5.
3. Restart the computer.
4. When it has completed uninstalling you can close Add or Remove Programs and your Control Panel.
5. Close all programs.
6. Search and delete the following infected entries in registry. If you do not know how to edit registry, click here to read more.
HKEY_LOCAL_MACHINE\SOFTWARE\AntivirusHKEY_CURRENT_USER\Software\AntivirusHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\“Antivirus” = “%ProgramFiles%\Antivirus 2009\Antvrs.exe”
7. Stop Antivirus 2009 process. If you do not know how to stop a running process, click here to read more.
8. Find and delete the following infected files from your system. Don’t worry if you don’t find these files. Just proceed to next step.
shlwapi.dllwininet.dllAntivirus 2009.lnkav2009.exeAntivirus2009.exe
If you do not know how to find it or having difficulties locating the file, click here to read more.
9. Rename the files that you found above to “foundbadfile1.dll” and “foundbadfile2.dll” (if you can not rename this file, then try to restart your computer in safe mode then try to rename this file.) If you don’t know how to start the computer in safe mode, click here to read more.
10. Go to C:\Program Files\ folder and delete the “Antivirus 2009′ folder (if you can’t delete it, reboot your computer to safe mode then delete the folder. Do not worry about it if you can’t find this folder.)
11. Click here to bookmark this page (you will need to comeback to this page after reboot)(If you are using Firefox click on Ctrl+D on your keyboard to bookmark this page)
12. Restart your computer
13. Go to your computer and delete the “foundbadfile1.dll” and “foundbadfile2.dll” file
14. You have just removed Antivirus 2009 from your computer manually.

Remove Antivirus 2009 with SmitfraudFix:
SmitfraudFix is a free tool that S!Ri created to remove fake anti-spyware programs. It can be risky so we cannot guarantee the result. Please use it with reservations. We would never recommend to purchase anything unless it’s necessary. That’s why we produce this free removal process.
1. Download SmitfraudFix tool and save it to your desktop.
2. Restart your computer and boot into Safe Mode. If you don’t know how to start the computer in safe mode, click here to read more.
3. Double-click on the SmitfraudFix.exe icon then follow the screen instructions. Option #2 should be selected in this case.
4. When you are prompted with “Do you want to clean the registry ?”, simply answer “Y”.
5. Reboot.
6. You should have removed Antivirus 2009 from your computer. Sometimes it might take more than once to work properly. If SmitfraudFix removal tool does not work, which is in no-guarantee due to the nature of spyware, please refer to the manual removal steps above or purchase a legitimate removal tool if necessary.

The following process will help you remove Antivirus 2009 from your system easily and safely.

Antivirus 2009 Manual Removal Process:
1. Click on the Start Menu button, then click on the Control Panel option, and then Double-click on the Add or Remove Programs icon.
2. Locate Antivirus 2009 and double-click on it to uninstall Antivirus 2009. Follow the screen step-by-step screen instructions to complete uninstallation of Antivirus 2009. Do not worry about this if you cannot find it in Add/Remove window. Simply skip to #5.
3. Restart the computer.
4. When it has completed uninstalling you can close Add or Remove Programs and your Control Panel.
5. Close all programs.
6. Search and delete the following infected entries in registry. If you do not know how to edit registry, click here to read more.
HKEY_LOCAL_MACHINE\SOFTWARE\AntivirusHKEY_CURRENT_USER\Software\AntivirusHKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run\“Antivirus” = “%ProgramFiles%\Antivirus 2009\Antvrs.exe”
7. Stop Antivirus 2009 process. If you do not know how to stop a running process, click here to read more.
8. Find and delete the following infected files from your system. Don’t worry if you don’t find these files. Just proceed to next step.
shlwapi.dllwininet.dllAntivirus 2009.lnkav2009.exeAntivirus2009.exe
If you do not know how to find it or having difficulties locating the file, click here to read more.
9. Rename the files that you found above to “foundbadfile1.dll” and “foundbadfile2.dll” (if you can not rename this file, then try to restart your computer in safe mode then try to rename this file.) If you don’t know how to start the computer in safe mode, click here to read more.
10. Go to C:\Program Files\ folder and delete the “Antivirus 2009′ folder (if you can’t delete it, reboot your computer to safe mode then delete the folder. Do not worry about it if you can’t find this folder.)
11. Click here to bookmark this page (you will need to comeback to this page after reboot)(If you are using Firefox click on Ctrl+D on your keyboard to bookmark this page)
12. Restart your computer
13. Go to your computer and delete the “foundbadfile1.dll” and “foundbadfile2.dll” file
14. You have just removed Antivirus 2009 from your computer manually.

Remove Antivirus 2009 with SmitfraudFix:
SmitfraudFix is a free tool that S!Ri created to remove fake anti-spyware programs. It can be risky so we cannot guarantee the result. Please use it with reservations. We would never recommend to purchase anything unless it’s necessary. That’s why we produce this free removal process.
1. Download SmitfraudFix tool and save it to your desktop.
2. Restart your computer and boot into Safe Mode. If you don’t know how to start the computer in safe mode, click here to read more.
3. Double-click on the SmitfraudFix.exe icon then follow the screen instructions. Option #2 should be selected in this case.
4. When you are prompted with “Do you want to clean the registry ?”, simply answer “Y”.
5. Reboot.
6. You should have removed Antivirus 2009 from your computer. Sometimes it might take more than once to work properly. If SmitfraudFix removal tool does not work, which is in no-guarantee due to the nature of spyware, please refer to the manual removal steps above or purchase a legitimate removal tool if necessary.